Technical bulletin : Part IX local area risk level

'DRINKING WATER. .

Source protection

ACT FOR CLEAN WATER

Technical Bulletin: Part IX Local Area Risk Level

Date: April 2010

Ontario Ministry of the Environment
Ontario Ministry of Natural Resources

Clarification of the technical terms and alternate method for the assessment
and assignment of a risk level to a local area.

The Clean Water Act, 2006 (the Act), which came into effect in July 2007, sets the legal
framework that ensures communities are able to protect their municipal drinking water supplies
by developing collaborative, locally driven, science-based protection plans. Communities will
identify potential risks to local water sources and take action to reduce or eliminate these risks.

In October 2006, the Ministry of the Environment (MOE) issued the document called
"Assessment Report: Draft Guidance Modules" to guide the tasks being undertaken for the
source protection technical studies in advance of the technical rules and regulations under the
Clean Water Act, 2006.

The development of the assessment report is set out in the Act, regulation 287/07, and the
"Technical Rules: Assessment Report" (the technical rules), dated November 2009. With the
technical rules coming into effect, some of the methods set out in the Draft Guidance Modules
are no longer valid. This Technical Bulletin provides updated guidance in certain areas.

The province has three (3) Tier 3 Water Quantity Risk Assessment (WQnRA) projects
underway to implement the approach set out in the Technical Rules. In undertaking these first
projects, the province has identified a number of situations where the methods in the technical
rules are not sufficient to meet the intent of the Act.

Based on these projects, the Part IX - Local Area Risk Level of the Technical Rules has been
reviewed as a result of the ongoing Tier 3 WQnRA projects. As consequence, where necessary,
an alternative approach may be required to assign a local area risk level. The following
approach is a tested and consistent alternative approach that can be applied by any source

J>>

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Technical Bulletin: Part IX Local Area Risk Level

protection committee (SPC) in the province to evaluate the circumstances in which water
quantity threats could be considered as significant or moderate threats in their source
protection area.

The focus of this Technical Bulletin is to provide clarity on the following:

The assessment of the circumstances in which significant and moderate local area risk
levels are assigned, by providing tables that link the type of system, temporal and
landscape scenarios and the circumstances for each scenario;

• The application and evaluation of "tolerance" and "other uses", as part of the assessment
of circumstances. This method would clearly align with the method used to evaluate the
risk of water quality threats through an assessment of circumstances:

By undertaking the risk assessment following the tables provided in this technical
bulletin, the tables would clearly guide the application of tolerance only to existing
municipal systems and only when average demand can be met but peak demands cannot.

Also, the tables would clearly guide the consideration of "other uses" only for planned
municipal systems or existing municipal systems with committed demand for average
conditions. Other uses would not be considered for existing systems or drought scenarios.

The introduction of thresholds when considering "other uses" for the reduction of
groundwater discharge-surface water flows (because of increased groundwater pumping)
for cold water fisheries in headwaters of rivers and streams;

The introduction of professional judgement (unacceptable impacts or measurable but
potentially unacceptable impacts to regulated water levels and/or flows or permits,
aquatic habitat of river systems and provincially significant wetlands) to assist in
assigning risk levels to local areas;

The clarification of terms used in the evaluation of Risk Level under Part IX of the
Technical Rules, such as allocated and committed demands

The result is an assigned level of risk to the local area thereby eliminating the term
"exposure", which becomes irrelevant following the proposed alternative approach and tables
of circumstances.

Alternative Approach for Assigning a Risk Level to a Local Area

This Technical bulletin has been organised into the following Sections:

1. Alternative Approach for Part IX - Local Area Risk Level

Taskl: Evaluation of Risk
Task 2: Tolerance Level, Existing Drinking Water Systems

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Technical Bulletin: Part IX Local Area Risk Level

Task 3: Assignment of Risk Level

2. Clarifications in Regard to Allocated Quantity of Water

3. Rule 15.1 - Alternative Approach

These sections describe the steps required to undertake Part IX - Local Area Risk Level of
the Technical Rules required for water quantity risk assessment of the Assessment Report in
assigning a risk level to a local area, by following an alternative approach which reflects the
above clarifications.

1. Alternative Approach for Part IX - Local Area Risk Level

Task 1: Evaluation of Risk Level

(1) A risk level must be assigned to every local area required to be delineated in accordance
with Part III of the Technical Rules. The risk level must be assigned by:

•

•

evaluating the scenarios developed in the water budget models for the Tier 3 of the
WQnRA, and described in Tables 4A and 4B which are provided below in this
Technical Bulletin

for each scenario, evaluating the circumstances in Tables 4C and 4D which are
provided below in this Technical Bulletin.

Tables 4A and 4B describe respectively the Surface Water and the Groundwater Risk
Scenarios. For each assessment Scenario, the Tables provide the time period for the
assessment, as well as requirements for land cover, municipal allocated pumping rate, non-
municipal pumping rates and model simulation approach.

Tables 4C and 4D provide the Circumstances to be taken into account for each Scenario to
assign significant or moderate Risk, for each type of drinking water system.

(2) For the purposes of assessing the circumstances described in Tasks 2 and 3 below:

(A) the time period to be assessed is the time period described in Column 2 of Tables
4A and 4B; and

(B) the data used shall meet the requirements listed in Columns 3 and 4 of Tables 4A
and 4B where one or more parameters in respect of the data are listed, and in all
other cases the data shall be reflective of conditions that existed during the time
period.

(3) For the purposes of Task 3 below, the other uses of water in the area are,

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Technical Bulletin: Part IX Local Area Risk Level

(A) with respect to surface water,

(a) waste water assimilation,

(b) surface water takings downstream of the intake or intakes,

(c) electric power generation,

(d) navigation,

(e) recreation,

(f ) aquatic habitat, and

(g) provincially significant wetlands; and

(B) with respect to groundwater,

(h) down gradient groundwater takings by other persons in the area,

(i) aquatic habitat, and

(j ) provincially significant wetlands .

Task 2: Tolerance Level, Existing Drinking Water Systems

If the local area relates to an existing municipal drinking water system, a tolerance level must
be assigned in accordance with the approach described below:

An existing type I, II or III system shall be assigned one of the following tolerance levels:

(1) High, if the system obtains water from a surface water intake relating to a local
area assessed in accordance with the circumstances described in Task 3.1 (l)(b) of
this Technical Bulletin and at all times during that assessment, the system would
have been capable of meeting the peak demands of users of the system.

(2) High, if the system obtains water from a well relating to a local area assessed in
accordance with the circumstances described in Task 3.1 (2)(b) of this Technical
Bulletin and at all times during that assessment, the system would have been
capable of meeting the peak demands of users of the system.

(3) Low, if a tolerance level is not assigned in accordance with either of (1) or (2)
above.

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Technical Bulletin: Part IX Local Area Risk Level

Task 3: Assignment of Risk Level.

The models used in Part III of the Technical Rules to prepare the water budget for the local
area shall be used to assess the scenarios described in Task 3.

Task 3.1: Assignment of Significant Risk Level

A local area has a risk level of significant if one or more of the following circumstances
exist:

(1) Scenarios A and B in Tables 4A and 4C - One or More Surface Water Intakes.

(a) If at any time during scenario A or B the quantity of water that could have been
taken from surface water bodies in the local area would not have been sufficient
to meet the allocated quantity of water taken by those municipal surface water
intakes.

(b) If at any time during scenario A or B the quantity of water that could have been
taken from surface water bodies in the local area would have been sufficient to
meet the allocated quantity of water taken by those municipal surface water
intakes and the tolerance is Low.

(2) Scenarios C and D in Tables 4B and 4D - One or More Groundwater Wells

(a) If at any time during scenario C or D the quantity of water that could have been
taken from groundwater in the local area would not have been sufficient to meet
the allocated quantity of water taken by those municipal groundwater wells.

(b) If at any time during scenario C or D the quantity of water that could have been
taken from groundwater in the local area would have been sufficient to meet the
allocated quantity of water taken by those municipal groundwater wells and the
tolerance is Low.

(3) Scenarios El, E2, E3 and Fl, F2, F3 in Tables 4A and 4C
Intakes.

One or More Surface Water

(a) If a planned system or an existing system with a committed demand greater than 0
L/s, at any time during scenarios El, 2,3 or Fl,2,3 the quantity of water that can be
taken from surface water bodies in the local area would not be sufficient to meet
the allocated quantity of water for those municipal surface water intakes.

(b) If a planned system or an existing system with a committed demand greater than 0
L/s, at any time during scenario El, 2,3 the quantity of water that can be taken
from surface water bodies in the local area would be sufficient to meet the
allocated quantity of water for those municipal surface water intakes and one or
more of the following circumstance exists:

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Technical Bulletin: Part IX Local Area Risk Level

(i) the reduction in existing surface water levels and/or flows results, in response
to the allocated pumping rates, in unacceptable impacts to existing regulated
water levels and/or flows or permits.

(ii) the reduction in existing surface water levels and/or flows results, in response
to the allocated pumping rates, in unacceptable impacts to aquatic habitat and
provincially significant wetlands.

(4) Scenarios Gl, G2, G3 and HI, H2, H3 in Tables 4B and 4D
Groundwater Wells

One or More

(a) If a planned system or an existing system with a committed demand greater than 0
L/s, at any time during scenarios Gl,2,3 or HI, 2,3 the quantity of water that can
be taken from groundwater in the local area would not be sufficient to meet the
allocated quantity of water for those municipal groundwater wells.

(b) If a planned system or an existing system with a committed demand greater than 0
L/s, at any time during scenarios Gl,2,3 the quantity of water that can be taken
from groundwater in the local area would be sufficient to meet the allocated
quantity of water for those municipal groundwater wells and one or more of the
following circumstance exists:

(i) the reduction in existing groundwater levels and/or flows results, in response
to the allocated pumping rates, in unacceptable impacts to existing regulated
water levels and/or flows or permits.

(ii) the reduction in existing groundwater discharge, in response to the allocated
pumping rates, into a coldwater watercourse by a threshold calculated as
greater than 20 percent as compared to the existing estimated monthly
streamflow Qp80 (the flow that is exceeded 80 percent of the time) or the
average monthly baseflow of the watercourse or another threshold that has
already been defined as a condition in an exiting permit.

(iii) the reduction in existing groundwater levels and/or flows results, in response
to the allocated pumping rates, in unacceptable impacts to provincially
significant wetlands.

Task 3.2: Assignment of Moderate Risk Level

A local area has a risk level of moderate if one or more of the following circumstances exist:

(1) Scenarios El, E2, E3 in Tables 4A and 4C - One or More Surface Water Intakes .

(a) If a planned system or an existing system with a committed demand greater than 0
L/s, at any time during scenarios E 1,2,3 the quantity of water that can be taken
from surface water bodies in the local area would be sufficient to meet the

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Technical Bulletin: Part IX Local Area Risk Level

allocated quantity of water for those municipal surface water intakes and one or
more of the following circumstance exists:

(i) the reduction in existing surface water levels and/or flows results, in response
to the allocated pumping rates, in measurable and potentially unacceptable
impacts to existing regulated water levels and/or flows or permits.

(ii) the reduction in existing surface water levels and/or flows results, in response
to the allocated pumping rates, in a measurable and potentially unacceptable
impact to aquatic habitat and provincially significant wetlands.

(2) Scenarios Gl, G2, G3 in Tables 4B and 4D - One or More Groundwater Wells

(a) If a planned system or an existing system with a committed demand greater than 0
L/s, at any time during scenarios Gl,2,3 the quantity of water that can be taken
from groundwater in the local area would be sufficient to meet the allocated
quantity of water for those municipal groundwater wells and one or more of the
following circumstance exists:

(i) the reduction in existing groundwater levels and/or flows results, in response
to the allocated pumping rates, in measurable and potentially unacceptable
impacts to existing regulated water levels and/or flows or permits.

(ii) the reduction in existing groundwater discharge, in response to the allocated
pumping rates, into a coldwater watercourse by a threshold calculated
between a minimum of 10 percent but not greater than 20 percent as compared
to the existing estimated monthly streamflow Qp80 (the flow that is exceeded
80 percent of the time) or the average monthly baseflow of the watercourse or
another threshold that has already been defined as a condition in an exiting
permit.

(iii) the reduction in existing groundwater levels and/or flows results, in response
to the allocated pumping rates, in measurable but acceptable impacts to
provincially significant wetlands.

Task 3.3: Uncertainty and Sensitivity Analysis

An analysis of the uncertainty, characterized as high or low, must be made in respect of the
risk level for the local area.

(1) The following factors shall be considered in an analysis of uncertainty for Task 3.2:

(a) The distribution, variability, quality and relevance of the available input data;

(b) The ability of the methods and models used to accurately reflect the hydrologic
system;

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Technical Bulletin: Part IX Local Area Risk Level

(c) The quality assurance and quality control procedures applied; and

(d) The extent and level of calibration and validation achieved for any groundwater and
surface models used or calculations and general assessments completed.

(2) Despite Task 3.2, a local area has a risk level of significant if,

(a) uncertainty determined in accordance with (1) is high; and

(b) a sensitivity analysis of the data used to prepare the water budget for the local area
suggests that the risk level for the local area could be significant.

Task 3.4: Assignment of Low Risk Level

Where a local area was not assigned a risk level of significant or moderate in accordance
with Tasks 3.1, 3.2 and 3.3, the local area has a risk level of low.

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Technical Bulletin: Part IX Local Area Risk Level

Table 4A - Surface Water Risk Scenarios

Scenario

Time
Period

Surface Water Model Scenarios

Land Cover

Allocated

Pumping

Rate

(municipal)

Pumping
Rate
(non-
municipal)

Model Simulation

A

The

period

for which

climate

and

stream

flow data

are

available

for the

local area

Existing

Existing

Existing

Continuous (Daily);
Monthly pumping

B

2/10
year
drought
period

Existing

Existing

Existing

Continuous (Daily);
Monthly pumping

E(l)

The

period

for which

climate

and

stream

flow data

are

available

for the

local area

Land cover
reflective of
the planned
or existing

plus

committed

(Official Plan)

Existing plus

committed

plus planned

Future

New

Imperviou

s Areas

and
Increase
in Total
Demand

Continuous
(Daily);
Monthly
pumping

E(2)

Existing

Existing plus

committed

plus planned

Existing

Increase

in
Municipal
Demand

E(3)

Land cover
reflective of
the planned
or existing

plus

committed

(Official Plan)

Existing

Future

New

Imperviou

s Areas

and
Increase
in Non-
Municipal
Demand

F(D

2/10
year
drought
period

Land cover
reflective of
the planned
or existing

plus

committed

(Official Plan)

Existing plus

committed

plus planned

Future

New

Imperviou

s Areas

and
Increase
in Total
Demand

Continuous
(Daily);
Monthly
pumping

F(2)

2/10
year
drought
period

Existing

Existing plus

committed

plus planned

Existing

Increase

in
Municipal
Demand

F(3)

2/10
year
drought
period

Land cover
reflective of
the planned
or existing

plus

committed

(Official Plan)

Existing

Future

New

Imperviou

s Areas

and
Increase
in Non-
Municipal
Demand

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Technical Bulletin: Part IX Local Area Risk Level

Table 4B

- Groundwater Risk Scenarios

Scenario

Time
Period

Groundwater Model Scenarios

Land Cover

Allocated

Pumping

Rate

(municipal)

Pumping
Rate

(non-
municipal)

Model Simulation

c

The

period

for

which

climate

and

stream

flow

data are

available

for the

local

area

Existing

Existing

Existing

Steady-state, Average
Annual Recharge

D

10 year
drought
period

Existing

Existing

Existing

Transient; Monthly

pumping and recharge

rates

G(l)

The

period

for

which

climate

and

stream

flow

data are

available

for the

local

area

Land cover

reflective of

the planned or

existing plus

committed

(Official Plan)

Existing plus

committed

plus planned

Future

GW
Recharge
Reduction

and
Increase
in Total
Demand

Steady-
State;
Average
Annual
Recharge

G(2)

Existing

Existing plus

committed

plus planned

Existing

Increase

in
Municipal
Demand

G(3)

Land cover

reflective of

the planned or

existing plus

committed

(Official Plan)

Existing

Future

GW
Recharge
Reduction

and
Increase
in Non-
Municipal
Demand

H(l)

10 year
drought
period

Land cover

reflective of

the planned or

existing plus

committed

(Official Plan)

Existing plus

committed

plus planned

Future

GW
Recharge
Reduction

and
Increase
in Total
Demand

Transient;
Monthly
pumping

and
recharge

H(2)

10 year
drought
period

Existing

Existing plus

committed

plus planned

Existing

Increase

in
Municipal
Demand

H(3)

10 year
drought
period

Land cover

reflective of

the planned or

existing plus

committed

(Official Plan)

Existing

Future

GW
Recharge
Reduction

and
Increase
in Non-
Municipal
Demand

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Technical Bulletin: Part IX Local Area Risk Level

Table 4C - Risk Scenarios and Circumstances - Surface Water

Local Area - Significant Risk

Type of System

Scenarios

Circumstance

Surface Water
One or More

A- Existing - average annual
B- Existing - 2/10 year drought

a) the quantity of water that could have been taken from surface water bodies in the
local area would not have been sufficient to meet the allocated quantity of water
taken by those municipal surface water intakes.

b) the quantity of water that could have been taken from surface water bodies in the
local area would have been sufficient to meet the allocated quantity of water taken
by those municipal surface water intakes and the tolerance is Low.

Surface Water
One or More

E- Planned system or existing system
with committed demand - average
annual

a) the quantity of water that can be taken from surface water bodies in the local
area would not be sufficient to meet the allocated quantity of water for those
municipal surface water intakes.

b) the quantity of water that can be taken from surface water bodies in the local
area would be sufficient to meet the allocated quantity of water for those municipal
surface water intakes and one or more of the following circumstance exists:

(i) the reduction in existing surface water levels and/or flows results, in
response to the allocated pumping rates, in unacceptable impacts to existing
regulated water levels and/or flows or permits.

(ii) the reduction in existing surface water levels and/or flows results, in
response to the allocated pumping rates, in unacceptable impacts to aquatic
habitat and provincially significant wetlands.

(iii) the reduction in existing groundwater levels and/or flows results, in
response to the allocated pumping rates, in unacceptable impacts to
provincially significant wetlands.

Surface Water
One or More

F- Planned system or existing system
with committed demand - 2/10 year
drought

a) the quantity of water that can be taken from surface water bodies in the local
area would not be sufficient to meet the allocated quantity of water for those
municipal surface water intakes.

Local Area - Moderate Risk

Surface Water
One or More

E - Planned system or existing system
with committed demand - average
annual

a) the quantity of water that can be taken from surface water bodies in the local
area would be sufficient to meet the allocated quantity of water for those municipal
surface water intakes and one or more of the following circumstance exists:

(i) the reduction in existing surface water flows and/or levels results, in
response to the allocated pumping rates, in measurable and potentially
unacceptable impacts to existing regulated water levels and/or flows or permits.

(ii) the reduction in existing surface water levels and/or flows results, in
response to the allocated pumping rates, in measurable and potentially
unacceptable impacts to aquatic habitat and provincially significant wetlands.

(iii) the reduction in existing groundwater levels and/or flows results, in
response to the allocated pumping rates, in unacceptable impacts to provincially
significant wetlands.

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Technical Bulletin: Part IX Local Area Risk Level

Table 4D - Risk Scenarios and Circumstances - Groundwater

Local Area - Significant Risk

Type of System

Scenarios

Circumstance

Groundwater
One or More

C - Existing - average annual
D -Existing - 10 year drought

a) the quantity of water that could have been taken from groundwater in the local
area would not have been sufficient to meet the allocated quantity of water taken
by those municipal groundwater wells.

b) the quantity of water that could have been taken from groundwater in the local
area would have been sufficient to meet the allocated quantity of water taken by
those municipal groundwater wells and the tolerance is Low.

Groundwater
One or More

G - Planned system or existing system
with committed demand - average
annual

a) the quantity of water that can be taken from groundwater in the local area would
not be sufficient to meet the allocated quantity of water for those municipal
groundwater wells.

b) the quantity of water that can be taken from groundwater in the local area would
be sufficient to meet the allocated quantity of water for those municipal
groundwater wells and one or more of the following circumstance exists:

(i) the reduction in existing groundwater levels and/or flows results, in response
to the allocated pumping rates, in unacceptable impacts to existing regulated
water levels and/or flows or permits.

(ii) the reduction in existing groundwater discharge, in response to the allocated
pumping rates, into a coldwater watercourse by a threshold calculated as
greater than 20 percent as compared to the existing estimated monthly
streamflow Qp80 (the flow that is exceeded 80 percent of the time) or the
average monthly baseflow of the watercourse or another threshold that has
already been defined as a condition in an exiting permit.

(iii) the reduction in existing groundwater levels and/or flows results, in
response to the allocated pumping rates, in unacceptable impacts to
provincially significant wetlands.

Groundwater
One or More

H - Planned system or existing system
with committed demand - 10 year
drought

a) the quantity of water that can be taken from groundwater in the local area would
not be sufficient to meet the allocated quantity of water for those municipal
groundwater wells.

Local Area - Moderate Risk

Groundwater
One or More

G - Planned system or existing system
with committed demand - average
annual

a) the quantity of water that can be taken from groundwater in the local area would
be sufficient to meet the allocated quantity of water for those municipal
groundwater wells and one or more of the following circumstance exists:

(i) the reduction in existing groundwater levels and/or flows results, in response
to the allocated pumping rates, in measurable and potentially unacceptable
impacts to existing regulated water levels and/or flows or permits.

(ii) the reduction in existing groundwater discharge, in response to the allocated
pumping rates, into a coldwater watercourse by a threshold calculated between
a minimum of 10 percent but not greater than 20 percent as compared to the
existing estimated monthly streamflow Qp80 (the flow that is exceeded 80
percent of the time) or the average monthly baseflow of the watercourse or
another threshold that has already been defined as a condition in an exiting
permit.

(iii) the reduction in existing groundwater levels and/or flows results, in
response to the allocated pumping rates, in measurable and potentially
unacceptable impacts to provincially significant wetlands.

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Technical Bulletin: Part IX Local Area Risk Level

2. Clarifications in Regard to Allocated Quantity of Water

Column 4 of Tables 4A and 4B describes the allocated quantity of water that each of the
scenarios must consider when assessing the circumstances in Tables 4C and 4D

Allocated Quantity of Water - Existing Systems

The allocated quantity of water for Scenarios that require an existing pumping rate is the
lesser of:

• the maximum annual quantity of water that can lawfully be taken by the intake or
well (i.e. the maximum annual permitted rate); and

• the sum of the mean annual quantity of water taken by the intake or well (i.e. the
existing mean annual pumping rate during the study year) and any additional quantity
of water that would have to be taken annually by the intake or well to meet the
committed demand of the system (i.e. existing plus committed annual pumping rates).

Planned Drinking Water System

A Planned Drinking Water System, is a drinking water system that is to be established, or a
part of a drinking water system that is to be established, if (Clean Water Act - O. Reg. 287/07
(General)- SI (1):

(a) approval to proceed with the establishment of the system or part has been
given under Part II of the Environmental Assessment Act,

(b) the establishment of the system or part has been identified as the preferred
solution within a completed planning process conducted in accordance with an
approved class environmental assessment under Part II. 1 of the Environmental
Assessment Act and no order has been issued under subsection 16 (1) of that Act, or

(c) the system or part would serve a reserve as defined in the Indian Act
(Canada); ("envisage")

The appropriate tools for planning future water supplies are the Planning Act, the Provincial
Policy Statement (PPS) and the Class Environmental Assessment (EA) process. There is no
legal authority in the Clean Water Act (CWA) to force municipalities to plan for their future
water supply needs - municipalities already have the power to do this under the Planning Act
and through the PPS. The Class EA process is used to identify and locate future water supply
and servicing needs. What the CWA does provide are the tools to look at existing systems
and systems that have been identified through this existing planning process (planned
systems).

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Technical Bulletin: Part IX Local Area Risk Level

Allocated Pumping Rate - Planned Systems

The allocated quantity of water for scenarios that require a planned pumping rate is the
planned amount per the O. Reg. 287/07 (General) - SI (1) and the lesser of:

(a) the maximum annual quantity of water that can lawfully be taken by the intake or
well (i.e. the maximum annual permitted rate); and

(b) the sum of the mean annual quantity of water taken by the intake or well (i.e. the
existing mean annual pumping rate during the study year) and any additional
quantity of water that would have to be taken annually by the intake or well to
meet the committed demand of the system (i.e. existing plus committed annual
pumping rates).

The following diagram provides a visual interpretation of the allocated quantity of water.

Allocated Quantity
of Water

Permitted Rate

"

& WTP Cof A Rate

I
I

r a

Committed
Demand

Existing
Demand

V )

Existing
Demand

V J

The Planned Demand plus:
the lesser amount between
the Existing, Existing plus
Committed, or the
Permitted Rate

Existing Demand
during the Study
Year

Planned
Demand

Planned
Demand

Planned
Demand

The Planned Demand has EA approval with known
intake/well locations and pumping rates.

_ J X

Existing Demand
plus any short-
term Committed
Demand.

Can not exceed the
WTP CofA Rate or
Permitted Rate

Planned Demand

plus
Existing Demand

Planned Demand

plus

Existing Demand

plus

Committed Demand

Planned Demand

plus
Permitted Rate

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Technical Bulletin: Part IX Local Area Risk Level

3. Rule 15.1 - Alternative Approach

If an SPC uses the above Part IX recommended approach to assign risk to a local area, the
SPC should use Rule 15.1 to request Director approval. This would need to include an
explanation of how the method or approach used to assign the risk level is "equivalent to or
better than the approach or method prescribed in the rules". The requirements under Rule
15.1 are provided below.

Technical Rule 15.1

The Rule specifies that, despite any provision stated on any other rule, in preparing an
assessment report a source protection committee may use an alternate method or approach
for gathering information or for performing a task that departs from the method or approach
prescribed in these rules if the following conditions are met:

(1) The assessment report includes,

(a) a rationale for the departure; and

(b) an explanation of how the method or approach used by the source protection
committee to gather information or perform the task is equivalent to or better
than the approach or method prescribed in these rules

(2) The Director has provided the source protection committee with written confirmation that
he or she agrees to the departure and a copy of the confirmation is included in the assessment
report.

Protecting our environment*

If Ontario

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